Great Plains 2420 Operator Manual - Manual (Page 17)

15
Section 3 Adjustments
5/15/06 2400, 2410 and 2420 Three-Point Drill 118-706M
Great Plains Mfg., Inc.
Section 3
Adjustments
Seeding Depth
The three-point drill has double-disk openers with press
wheels. The following is an explanation to how the open-
ers work.
Models 2400 and 2410
Down Pressure: Opener springs provide the down pres-
sure necessary for opener disks to open a seed trench.
The springs allow openers to float down into depressions
and up over obstructions.
Seeding Depth: A press wheel attached to each opener
body controls seeding depth. To maintain consistent
depth, the relationship between the bottom of the opener
disks and press wheel is fixed upwardly by an adjustable
stop on each opener. The position of the adjustable stop
determines seeding depth. Raising the stop increases
seeding depth. Lowering the stop decreases seeding
depth.
Soil Firming: The press wheels also close the seed trench
and gently press soil over seed. To provide consistent soil
firming, press wheels are free to move down from normal
operating position. This maintains pressing action even if
opener disks encounter obstructions or hard soil.
Model 2420
Down Pressure: Opener springs provide the down pres-
sure necessary for opener disks to open a seed trench.
The springs allow the openers to float down into depres-
sions and up over obstructions.
Seeding Depth: Side depth wheels on the opener disks
gauge opener seeding depth. The position of the adjust-
able stop determines seeding depth. Raising the stop rais-
es the side depth wheels and increases seeding depth.
Lowering the stop lowers the side depth wheels and
decreases seeding depth.
Soil Firming: Press wheels are attached to each opener
body. The press wheels close the seed trench and gently
press soil over seed. An adjustable spring in the press-
wheel mechanism creates the down pressure needed to
close the seed trench.
Opener Down Pressure
You can adjust down pressure individually for each open-
er. This is useful for penetrating hard soil and planting in
tire tracks.
Use only enough down pressure to cut the seed trench
and maintain proper soil-firming over seed. Excessive
opener down force will lead to premature wear on opener
components.
2400
To adjust down pressure, remove the W clip from spring
rod. Put clip in a higher hole for more pressure or in a low-
er hole for less pressure as shown in Figure 3-1.
Figure 3-1
Opener Spring Adjustment, 00 Series Openers
2410
To adjust down pressure, use adjustment tool stored un-
der walkboard. Position tool in holes on spring mounting
plates. Pull down on adjuster as shown Figure 3-2. Move
the adjustment cam to the new setting.
Figure 3-2
Opener Spring Adjustment, 10 Series Openers
Minimum and maximum settings are indicated by position
of adjustment cam. See Figure 3-3.
Figure 3-3
Adjustment Cam
Maximum Pressure
12103
Minimum Pressure
12102
12105
Minimum Force
12104
Maximum Force